Everquest II Two Games on Two PCs Suddenly Can't Communicate

Greetings

I'm trying to track an issue that suddenly popped up. I have been using HotKeyNet for quite some time to run two games (Everquest, WoW, Rift, etc.) on two PCs and it has always worked. I overcame the issue in WoW as well and everything worked again. That led me to wonder if the same has been done in EverQuest II in a recent update, but I can't see anything.

Anyway, I send the command now to rename the two windows on the two computers and get confirmation on both HKNs but only the local window title is changed. I don't get any warning about anything being blocked and I have even gone into Windows Defender to allow EverQuest and HotkeyNet through the protection.

I'm at a loss. Can anyone suggest a possible fix for this? I'm totally stumped.